Revealing mistake: Duck's footplate clips through the platform at Knapford at the beginning.
Other mistake: In the distant shot of Vicarstown, the station is missing its letters.
Visible crew/equipment: A crew member is visible on the left side of the screen when Skarloey notices the hot air balloon is about to crash.
Revealing mistake: Before James collides with the tar tankers, he is already covered in tar before he actually hits them.
Thomas and the Billboard - S12-E1
Visible crew/equipment: At the very start of the episode, a stage light is reflected off Gordon's coaches.
Trivia: When Bill and Ben find Boco, there's a soup can on the left of the screen, dressed to be part of the set like a large oil drum or similar.
Visible crew/equipment: When Bill and Ben go by a level crossing, the top of the set is visible.
Snow Engine - S7-E14
Other mistake: Before Oliver crashes, no-one appears to be inside his cab in a shot of him passing a crossing.
Deliberate mistake: When Thomas goes by the level crossing, a close up of Thomas is shown but it's the same footage from season 1, only flipped. Because of this, Thomas' number is mirrored.
Visible crew/equipment: When the banner hits Gordon, in the next shot, a scaffold is very visible in the trees on the right. (Visible in Wide screen version only).
Thomas and the Runaway Car - S11-E17
Visible crew/equipment: When the flatbed rolls away from Thomas, you can see a finger of a crew member in the bottom corner.
Samson at Your Service - S18-E24
Revealing mistake: James is shifted on his body when Samson leaves him.
Visible crew/equipment: When James crashes into the tar wagons, a crew member's finger can be seen pushing him.
Visible crew/equipment: When the trucks are pushing Toby, in one shot you can see a crew member's hand pushing the trucks, then it vanishes.
Other mistake: In a close up of Bertie, he has no driver.
Visible crew/equipment: When Gordon, Thomas and the express round the bend, a camera tripod is visible on the left side of the screen.
Visible crew/equipment: When Thomas races through Elsbridge station, you can see a hand drop in and out of the shot on the top right.
Other mistake: When Percy meets Thomas at Elsbridge Station, he has a water line across his boiler, even though the water only came up to his footplate.
Answer: He was in the water.